Right now
The most recent data we hold from World Air Quality Index arrived 3 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
Reported by World Air Quality Index yesterday.
It is the 4th strongest of the 18 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 26 August 2026.
What the source measured
World Air Quality Index reported: AQI 164 (Unhealthy) at 中原平和公園
The air quality index read 164 (Unhealthy) at the 中原平和公園 station.
An estimated 20,089 people live within 5 km of this point.
Nearby, since 15 March 2026
- August 22, 2026 · score 31 · 10.0 km
How we know
One source: World Air Quality Index. Not yet confirmed by a second, independent source.
Our own score for this event is 41 out of 100, at 66 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Air Quality |
| Severity | Medium |
| Calamity Score (ours) | 41 / 100 |
| Our confidence | 66% |
| Coordinates | 35.5636, 139.6608 |
| Nearest City | Den’enchōfu (4 km) |
| Population Exposed | 20.1K within 5 km |
| Impact Tier | significant |
| Timestamp | 2026-09-05T09:00:00.000Z |
| Source | https://aqicn.org/city/@-514519 |
Score Breakdown
Technical Details
| Aqi | 164 |
| AqiCategory | Unhealthy |
| StationName | 中原平和公園 |
| StationUid | -514519 |
Safety Information
When air quality is hazardous: stay indoors with windows closed, and run a filtered air purifier if you have one. Avoid outdoor exercise. Children, older adults and anyone with heart or lung conditions are affected first and worst — an N95 respirator helps outdoors, a cloth mask does not.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens near Den’enchōfu?
Calamity.live data shows a air quality event with CalamityScore 41/100, near Den’enchōfu (Japan), based on data from waqi. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.